IONVIEW IMPROVEMENTS: DATA ACQUISITION AND SOFTWARE

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。列出的机构是 中心，不一定是研究者的机构。 我们已经开始实施更高性能的数据采集系统。开发是一个头阶段，也将作为一个数据采集设备。这一试验台将使我们能够生产出一种成本较低的便携式serp/seris系统。头级采用24位模数转换器，无需应用增益即可实现亚微伏分辨率，从而消除了超出转换器动态范围的问题。来自转换器的数据由运行在20 MHz的Microchip微控制器管理，并通过其USB接口发送到主机。该头还具有两个16位数模转换器，如果头级配置为电流测量并且具有被测信号的偏移，则可用于极化电位。USB端口为头部供电，因此无需其他连接。该头消除了对数据采集系统和机架安装放大器盒的需要。模拟信号路径也大大减少，最大限度地减少了其他设备干扰的可能性。我们希望进一步简化磁头，并迁移到USB 2.0，实现更快的吞吐量。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. We have moved on the implementation of a higher performance data acquisition system. The development is a head stage that will also serve as a data acquisition device. This head stage will enable us to produce a lower cost portable serp/seris system. The head stage uses a 24-bit analog to digital converter enabling sub microvolt resolution without applying gain and thus eliminating the issue of exceeding the dynamic range of the converter. Data from the converter is managed by a Microchip micro-controller running at 20 MHZ and sent to the host computer via its USB interface. The head also has two 16-bit digital to analog converters that can be used for the polarization potential if the head stage is configured for current measurement and has an offset for the signal being measured. The USB port powers the head so no other connection is required. The head eliminates the need for a data acquisition system and rack mount amplifier box. The analog signal path is also greatly reduced minimizing the possibility of interference from other equipment. We hope to further miniaturize the head and to migrate to USB 2.0 enabling much faster throughput.